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Multiarm Aniline Oligomers: Molecular Architecture, Self-Assembly, and Electrochromic Performance
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2020-03-27 , DOI: 10.1021/acs.jpcc.0c00694
Meng Wang 1 , Jie Fan 1 , Hao Lu 1 , Mingming Huang 1 , Xiaoyao Qiao 1 , Jiping Yang 1
Affiliation  

Solution-processable aniline oligomers with a benzene ring as the core and para, meta, and triple substituted amino/carboxyl-capped tetraaniline (NH2-(Ani)4-COOH) as arms, named as Bi(p)-(Ani)4-COOH, Bi(m)-(Ani)4-COOH, and Tri-(Ani)4-COOH, were synthesized and characterized. It was found that aniline oligomers with increased arms presented a more regular porous breathing structure revealed by atomic force microscopy. An electrochemical quartz crystal microbalance was used to study their long-term stability by recording the mass change of electrochromic films during redox and analyze the mechanism of ion conduction in the electrochromic process. The results suggested that the porous breathing structure was conducive to H+ conduction, which contributed to their improved performance in switching time, coloration efficiency, and cycling stability. Tri-(Ani)4-COOH had the shortest switching time (tb = 1.45 s, tc = 1.82 s), highest coloration efficiency (190.7 cm2/C), and best cycling stability. Especially on the conductive glass, in 0.5 mol/L sulfuric acid electrolyte, it reached the charge retention of 96.8% after 3000 cycles, implying that the multiarm star-shaped aniline oligomer will be a promising material in electrochromic area with good processability, short switching time, and high cycling stability.

中文翻译:

多臂苯胺低聚物:分子结构,自组装和电致变色性能

可溶液处理的苯胺低聚物,以苯环为核心,对位,间位和三取代的氨基/羧基封端的四苯胺(NH 2-(Ani)4 -COOH)为臂,称为Bi(p)-(Ani)4 -COOH,Bi(m)-(Ani)4 -COOH和Tri-(Ani)4合成并表征了-COOH。发现具有增加的臂的苯胺低聚物表现出更规则的多孔呼吸结构,其通过原子力显微镜显示。通过记录氧化还原过程中电致变色膜的质量变化并分析电致变色过程中离子传导的机理,使用电化学石英晶体微量天平来研究其长期稳定性。结果表明,多孔呼吸结构有利于H +传导,有助于改善开关时间,着色效率和循环稳定性。Tri-(Ani)4 -COOH的切换时间最短(t b = 1.45 s,t c= 1.82 s),最高的着色效率(190.7 cm 2 / C)和最佳的循环稳定性。特别是在导电玻璃上,在0.5 mol / L的硫酸电解液中,经过3000次循环后,其电荷保持率达到96.8%,这意味着多臂星形苯胺低聚物将成为电致变色领域中具有良好加工性能,切换时间短的有前途的材料。时间长,循环稳定性高。
更新日期:2020-03-27
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